CN103076868B - The electronic system of method for managing power supply and application the method - Google Patents
The electronic system of method for managing power supply and application the method Download PDFInfo
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- CN103076868B CN103076868B CN201310003482.1A CN201310003482A CN103076868B CN 103076868 B CN103076868 B CN 103076868B CN 201310003482 A CN201310003482 A CN 201310003482A CN 103076868 B CN103076868 B CN 103076868B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
- G06F1/3228—Monitoring task completion, e.g. by use of idle timers, stop commands or wait commands
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3237—Power saving characterised by the action undertaken by disabling clock generation or distribution
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3296—Power saving characterised by the action undertaken by lowering the supply or operating voltage
Abstract
The present invention discloses the electronic system of a kind of method for managing power supply and application the method.This method for managing power supply, is applicable to comprise in the electronic system of CPU (central processing unit) and multiple peripheral modules, and the power supply status of CPU (central processing unit) has at least duty, the first low power consumpting state, the second low power consumpting state.Method for managing power supply comprises: when receive require that CPU (central processing unit) enters the second low power consumpting state request time, CPU (central processing unit) is set to the first low power consumpting state; Obtain the first standby time of each peripheral modules to calculate for the second standby time; Judge whether each peripheral modules does not all send data access request within the second standby time, when the second standby time, inside circumference module did not all send data access request, CPU (central processing unit) is set to the second low power consumpting state, wherein, the interval time that the peripheral modules being respectively for the first standby time corresponding is transmitted in two groups of data.
Description
Technical field
The present invention relates to the method for managing power supply of electronic system, particularly relate to the method for managing power supply of the electronic system with ACPI (Advanced Configuration and Power Interface, ACPI).
Background technology
How to reduce in non-usage the power consumption of computing machine and subsystem and the peripheral equipment thereof being in idle state, extend battery availability factor etc., it is for computer system electronic system, particularly to using the portable peripheral equipment electronic system of battery supplied electric power (such as, mobile computer, flat computer or mobile phone) most important.Therefore often all power management can be performed in electronic system, the specification of power management has a lot, such as ACPI (Advanced Configuration and Power Interface or ACPI) specification, it is the common open specification of a set of regarding power source administrative standard, be by Intel, Microsoft, the companies such as Toshiba formulated jointly, the arrange in pairs or groups hardware of electronic system of ACPI ACPI can provide the power supply and host work frequency that this electronic system is suitable, reaches power saving and efficiency and the target of depositing.It should be noted that, ACPI ACPI be software (as, operating system) and hardware between a common source management interface, its power management is directly dominated by operating system (Operation System), non-by this firmware (firmware) of BIOS dominate, the situation that specification that previously manufacturer out of the ordinary had formulated cannot be unified can be improved by this.
In general, operating system is all that the foundation entering battery saving mode is used as in the setting of reference applications or the setting of user, and operating system uses ACPI ACPI to go the power supply status of control hardware to comprise duty (G0), dormant state (G1), software dialysis state (G2), hardware off-state (G3).Under general environment, the switching of system between duty (G0) and dormant state (G1) is more, and wherein system has again the power supply power saving level of device support and the power saving level of CPU (central processing unit) support.Wherein ACPI definition CPU (central processing unit) power supply status (C0, C1, C2 ..., Cnstate) defined in (G0) all in working order, the wherein processor still normal process instruction when C0 state, and when computer system is idle within a period of time, CPU (central processing unit) then can be set to low power consumpting state by operating system, such as (C1, C2 to Cn state).
The low power consumpting state defining CPU (central processing unit) in ACPI ACPI comprises C1 state, C2 state, C3 state and C4 state, and C2 state is than the power saving of C1 state, and C3 state is than the power saving of C2 state, and C4 state is than the power saving of C3 state.In C2 state, CPU (central processing unit) does not perform any instruction, but the accessing operation of energy controlling bus master control set (Bus Master).Wherein Bus Master (Bus Master) be control bus in computer system element, such as USB controller, pci controller etc.In C3 state, central processing unit clock stops, also cannot the accessing operation of controlling bus master control set, and C4 state is compared with C3 state, and the voltage of CPU (central processing unit) can be lowered, to be in the low power consumpting state of the more degree of depth.
When the operating system in electronic system to detect in electronic system without any action more than one section of given time, CPU (central processing unit) will be made to enter C3 or C4 state, make electronic system more effectively reduce power consumption whereby.
Under C2 state, if having interrupt event to produce or CPU (central processing unit) requested execution instruction time, CPU (central processing unit) can get back to C0 state from C2 state.And under C3 or C4 state, if there is interrupt event to occur, CPU (central processing unit) can be waken up to C0 state from C3 or C4 state; If there is the access request of Bus Master to occur, CPU (central processing unit) can be waken up to C2 state by from C3 or C4 state.
Summary of the invention
The present invention discloses a kind of method for managing power supply, be applicable in an electronic system, wherein above-mentioned electronic system comprises a CPU (central processing unit) and multiple peripheral modules, and the power supply status of above-mentioned CPU (central processing unit) has at least one duty, one first low power consumpting state, one second low power consumpting state, above-mentioned method for managing power supply comprises: when receiving one and requiring that CPU (central processing unit) enters the second low power consumpting state request, and above-mentioned CPU (central processing unit) is set to above-mentioned first low power consumpting state; Obtain one first standby time that each above-mentioned peripheral modules is estimated; Above-mentioned first standby time according to each above-mentioned peripheral modules calculated for one second standby time; Judge whether all above-mentioned peripheral modules all do not send data access request within above-mentioned second standby time; And when within above-mentioned second standby time, above-mentioned peripheral modules does not all send data access request, above-mentioned CPU (central processing unit) is set to above-mentioned second low power consumpting state, wherein, the interval time that the above-mentioned peripheral modules being respectively corresponding each above-mentioned first standby time is transmitted in two groups of data.
The present invention discloses a kind of electronic system, comprising: a CPU (central processing unit), and the power supply status of above-mentioned CPU (central processing unit) has at least one duty, one first low power consumpting state, one second low power consumpting state, multiple peripheral modules, and a power management module, when receiving one and requiring that CPU (central processing unit) enters the second low power consumpting state request, above-mentioned CPU (central processing unit) is set to above-mentioned first low power consumpting state, wherein, one first standby time that above-mentioned power management module is estimated in order to obtain each above-mentioned peripheral modules, above-mentioned first standby time according to each above-mentioned peripheral modules calculated for one second standby time, and judge whether all above-mentioned peripheral modules all do not send data access request within above-mentioned second standby time, wherein, when within above-mentioned second standby time, above-mentioned peripheral modules does not all send data access request, above-mentioned CPU (central processing unit) is set to above-mentioned second low power consumpting state by above-mentioned power management module, wherein, the interval time that the above-mentioned peripheral modules that each above-mentioned first standby time is respectively corresponding is transmitted in two groups of data.
The present invention can be different according to peripheral modules at any time situation dynamically adjusted for the second standby time, and then electronic system can be extended in the time of the second low power consumpting state, and CPU (central processing unit) is in some cases avoided to switch between the first low power consumpting state and the second low power consumpting state frequently.
Accompanying drawing explanation
By reading following detailed description and citing by reference to the accompanying drawings, can more completely understand disclosed content:
Fig. 1 shows electronic system according to an embodiment of the invention;
Fig. 2 is the method for managing power supply process flow diagram showing an electronic system according to an embodiment of the invention;
Fig. 3 is the method for managing power supply process flow diagram showing an electronic system according to another embodiment of the present invention; And
Fig. 4 is the state timing chart of an embodiment of the data transmission of display peripheral modules.
Reference numeral explanation
100 ~ electronic system:
110 ~ CPU (central processing unit);
122 ~ power management module;
124-1,124-2,124-3 ~ peripheral modules;
C0, C2, C3, C4 ~ power supply status;
IDLE ~ idle/delay reminding signal;
T ~ time shaft;
T124-1, t124-2, t124-3 ~ first standby time;
T
idle~ the second standby time;
T0, T1, T2, T3, T4, T5 ~ time.
Embodiment
Below describe the embodiment that the many mat the present invention of display complete.Its describe in order to key concept of the present invention is described and without limit connotation.Scope of the present invention has best defining in claim of the present invention.
The invention provides a kind of method for managing power supply, be applicable to have in the electronic system of an ACPI (Advanced Configuration and Power Interface, ACPI).The present invention, according to the practical operation situation of current system, dynamically changes the time-count cycle of idle timer, also predicts the idle duration in certain embodiments, determine whether entering the state of more low-power consumption by this, to reach the balanced of system power dissipation and performance.On the other hand, also according to the opportunity of the state notifying of current electronic system each peripheral modules adjustment data transmission, therefore the time that CPU (central processing unit) is in low power consumpting state is more extended.
Fig. 1 shows electronic system according to an embodiment of the invention.Electronic system 100 mainly comprises a CPU (central processing unit) 110 and peripheral modules 124-1,124-2,124-3, electronic system 100 for example, adopt ACPI (Advanced Configuration and Power Interface, ACPI) define the power supply status of CPU (central processing unit) 110, then the power supply status of CPU (central processing unit) 110 comprises a duty (C0state) and multiple low power consumpting state (such as C1 state, C2 state, C3 state and C4 state etc.).In one embodiment, electronic system 100 also comprises a power management module 122, and power management module 122 is a Power Management Unit (Power Management Unit, PMU) such as, and it can in order to control the power supply status of CPU (central processing unit) 110.Wherein peripheral modules 124-1,124-2,124-3 can be bus marco element (Bus Master) or various input/output device, such as, PCIE controller, pci controller, HD Audio controller, SDIO and memory interface controller, keyboard/mouse controller, USB controller etc., but be not restricted to this.Be in the embodiment of the computer system of X86 platform in electronic system 100, be built in a chipset (chipset) in power management module 122 and peripheral modules 124-1,124-2,124-3.In certain embodiments, power management module 122 can produce idle alerting signal or delay reminding signal to all peripheral modules 124-1,124-2,124-3, with the opportunity of advising peripheral modules 124-1,124-2,124-3 carry out data transmission, thus extend the time that CPU (central processing unit) is in lower low power consumpting state.Should be appreciated that, in the embodiment of the present invention with three peripheral modules only in order to as an example, but the present invention is not limited to this, and electronic system 100 can only have single peripheral modules, or multiple peripheral modules.
Fig. 2 is the method for managing power supply process flow diagram of an electronic system according to an embodiment of the invention.The state timing chart of the embodiment that Fig. 4 represents peripheral modules 124-1, the data of 124-2,124-3 are transmitted.Below by the process flow diagram of Fig. 2 and the data transmission state sequential chart of composition graphs 4 illustrates the present invention.
In step S202, the requirement CPU (central processing unit) 110 that power management module 122 receives operating system (Operation System, figure do not illustrate) enters the second low power consumpting state (such as C3/C4 state) request.Then in step S204, CPU (central processing unit) 110 is first set to the first low power consumpting state (such as C2 state) by power management module 122, require that CPU (central processing unit) 110 enters the second low power consumpting state request as received during time T0 in Fig. 4, CPU (central processing unit) 110 switches to the first low power consumpting state (C2state) by duty (C0 state).
Here first illustrate operating system how to determine to enter the second low power consumpting state (such as C3/C4 state), and send to power management module 122 and describedly require that CPU (central processing unit) 110 enters the second low power consumpting state request.When in the operating system of electronic system 100, all programs (process) are all in dormant state, operating system can using an idle procedure (idle process) as active program.CPU (central processing unit) 110 is set to low power consumpting state by idle procedure request.Operating system is left unused situation and current idle condition predicting duration of leaving unused at present according to the history of electronic system 100.The threshold time of each low power consumpting state (such as C1 state, C2 state, C3 state and C4 state etc.) of this duration and CPU (central processing unit) 110 is compared, both (exit latency) when low power consumpting state exits latent can have been met to select one, the dbjective state that the low power consumpting state that at utmost can reduce CPU (central processing unit) 110 power consumption again enters as this, such as this duration is more than a given time, then select C3 state as dbjective state.Then operating system uses the hardware system (electronic system 100 as Fig. 1) of the interface function of driver (driver) notice electronic system 100 that CPU (central processing unit) 110 is set to selected low power consumpting state.
The hardware system (electronic system 100 as Fig. 1) of electronic system 100 of the present invention receives after operating system request CPU (central processing unit) 110 enters the request of C3/C4 state, CPU (central processing unit) 110 can't be set to C3/C4 state by the hardware system of electronic system 100 immediately, but first CPU (central processing unit) 110 is set to C2 state, then an idle timer is started, when bus master elements all in peripheral modules 124-1 ~ 124-3 is at (T time-count cycle of this idle timer
idle) in all do not send data access request, then control respective signal by power management module 122 and CPU (central processing unit) 110 be set to C3/C4 state.After CPU (central processing unit) 110 is set to C3/C4 state, when there being bus master element to send data access request in peripheral modules 124-1 ~ 124-3, CPU (central processing unit) 110 can be waken up to C2 state.
In an embodiment of the present invention, (T time-count cycle of this idle timer
idle) fixed value can be set as, but the system operating condition of reality has difference, is not suitable for the situation of various reality fixing time-count cycle.For example, if time-count cycle (T
idle) numerical value excessive, then CPU (central processing unit) 110 can reduce in the time of C3/C4 state, or even cannot enter C3/C4 state, on the other hand, if time-count cycle (T
idle) numerical value too small, then CPU (central processing unit) 110 can switch frequently between C2 state and C3/C4 state, and above situation all can make system power dissipation produce meaningless consumption.
Therefore the following process flow diagram by Fig. 2 the data transmission state sequential chart of composition graphs 4 describe in detail in another embodiment of the invention, how dynamically to determine (T time-count cycle of this idle timer
idle).In step S206, power management module 122 obtains each first standby time of the t of peripheral modules 124-1,124-2,124-3
124-1, t
124-2, t
124-3, wherein first standby time t
124-1, t
124-2, t
124-3be respectively corresponding peripheral modules 124-1, interval time that 124-2,124-3 transmit in two groups of data.Below with Fig. 4 illustrate peripheral modules 124-1,124-2,124-3 first standby time t
124-1, t
124-2, t
124-3.In the diagram, transverse axis is expressed as time shaft, and the rectangular square type on time shaft represents the task carrying out data transmission.Can notice, data transmission can be divided into transmission period (i.e. rectangular square type width on a timeline) and section standby time (i.e. blank width on a timeline between adjacent two rectangular square types) haply, each peripheral modules 124-1,124-2,124-3 can estimate its of value (i.e. between adjacent two rectangular square types of Fig. 4 blank width on a timeline) according to the design of self the first standby time and report to power management module 122.For peripheral modules 124-1 illustrate first standby time t
124-1assuming that peripheral modules 124-1 comprises the buffer zone that can keep in continuous 100us packet, and when this buffer zone is filled to the packet that namely 60%(fills continuous 60us) time start data transmission, with by data write dynamic RAM (DRAM) in buffer zone.Assuming that the data write dynamic RAM in buffer zone is needed 40us, when peripheral modules 124-1 receives packet, first by the buffer zone of data temporary storage in inside, when district to be buffered is filled to 60%, restart data transmission (taking 40us), then after 60us, buffer zone is filled to 60% again, then again start data transmission, by that analogy.Then known, the transmission period duration of peripheral modules 124-1 is 40us, and standby time section (i.e. the first standby time) t
124-1be then 60us.
In step S208, power management module 122 is according to each first standby time of the t of acquired each peripheral modules 124-1,124-2,124-3
124-1, t
124-2, t
124-3calculate second standby time T
idle.In certain embodiments, second standby time T
idlefor each first standby time t
124-1, t
124-2, t
124-3middle the maximum, for example, if first standby time t
124-1be greater than t
124-2and t
124-3, then second standby time T
idlecan be set to equal wherein maximum first standby time t
124-1.
In step S210, power management module 122 judge each peripheral modules whether in second standby time T
idleinside all do not send data access request.For example, in step S210, power management module 122 can start idle timer and carry out timing second T standby time
idle.If idle timer is at timing to the second T standby time
idleafterwards, when peripheral modules 124-1,124-2,124-3 still do not have data to transmit, as time T in Fig. 4
1to T
2period peripheral modules 124-1,124-2,124-3 do not send any data access request, then enter step S214.Otherwise, if idle timer is at timing second T standby time
idleperiod, when peripheral modules 124-1,124-2,124-3 have any one peripheral modules to send data access request, then enter step S212.
In step S212, meaning and peripheral modules 124-1, one of 124-2,124-3 in second standby time T
idleinside send data access request, now, power management module 122 maintains CPU (central processing unit) 110 and is arranged at the first low power consumpting state (such as C2 state), and waits for that corresponding peripheral modules turns back to step S206 after completing the corresponding transmission of the data corresponding to data access request.In one embodiment, if peripheral modules 124-1, one of 124-2,124-3 in second standby time T
idlewhen inside sending data access request (step S210's is no), power management module 122 can reset (reset) above-mentioned idle timer, and when electronic system 100 is left unused again after the data transmission that above-mentioned peripheral modules completes corresponding to data access request, restart idle timer with reclocking above-mentioned second standby time (namely performing step S210).The present invention in an embodiment, the peripheral modules 124-1 in electronic system 100,124-2,124-3 first standby time t
124-1, t
124-2, t
124-3time relatively stable, after step S212 is finished, also can not turn back to step S206, but directly return and perform step S210, namely again start idle timer with reclocking above-mentioned second standby time.In another embodiment, can step S206 be turned back to after step S212 is finished, by power management module 122 again according to obtain each peripheral modules 124-1,124-2,124-3 standby time calculate second standby time T
idle.
In step S214, meaning and peripheral modules 124-1,124-2,124-3 in second standby time T
idleinside all do not send data transfer request, with reference to time T in Fig. 4
2, now, CPU (central processing unit) 110 is set to the second low power consumpting state (as C3/C4 state) by power management module 122, to reduce the power attenuation of electronic system 100.On the other hand, after CPU (central processing unit) 110 enters the second low power consumpting state, if peripheral modules 124-1, one of 124-2,124-3 are in sending data access request, with reference to the time T3 of Fig. 4, if peripheral modules 124-1 sends data access request, then CPU (central processing unit) 110 can be waken up to the first low power consumpting state (as C2 state) from the second low power consumpting state (as C3/C4 state) to carry out corresponding data transmission by power management module 122.
Should be appreciated that, because CPU (central processing unit) 110 is not before entering the second low power consumpting state, power management module 122 can constantly turn back to step S206 with obtain peripheral modules 124-1,124-2,124-3 new first standby time t
124-1, t
124-2, t
124-3, and then calculate in step S208 new second standby time T
idle, therefore the present invention dynamically can change the time-count cycle of idle timer at any time, namely second standby time T
idle, determine whether entering the state of more low-power consumption.Therefore, be set to fixed value compared to by the time-count cycle of idle timer, the situation that the present invention can also be different according to peripheral modules at any time produce suitable length second standby time T
idle, and then electronic system can be extended in the time of more low power consumpting state (as C3/C4 state), and avoid CPU (central processing unit) 110 in some cases to switch between the first low power consumpting state and the second low power consumpting state frequently.
Fig. 3 is the method for managing power supply process flow diagram of an electronic system according to another embodiment of the present invention.In step s 302, power management module 122 receives operating system (Operation System, figure do not illustrate) enter the second low power consumpting state (such as C3/C4 state) request, then in step s 304, CPU (central processing unit) 110 is first set to the first low power consumpting state (such as C2 state) by power management module 122.
In step S306, power management module 122 obtains each first standby time of the t of peripheral modules 124-1,124-2,124-3
124-1, t
124-2, t
124-3, wherein first standby time t
124-1, t
124-2, t
124-3be respectively corresponding peripheral modules 124-1, interval time that 124-2,124-3 transmit in two groups of data, as shown in Figure 4.
In step S308, power management module 122 is according to each first standby time of the t of acquired each peripheral modules 124-1,124-2,124-3
124-1, t
124-2, t
124-3calculate second standby time T
idle, in certain embodiments, second standby time T
idlefor t standby time
124-1, t
124-2, t
124-3middle the maximum, or can be first standby time t
124-1, t
124-2, t
124-3middle the maximum is multiplied by suitable weighted value again.
Then, in step S310, power management module 122 also estimates the prediction standby time of this electronic system 100.For example, the standby time of electronic system 100 is the time that peripheral modules does not all send any data access request, as the time interval of the T1 to T3 of Fig. 4.Can according to multiple history standby time of this electronic system 100 to estimate electronic system 100 this prediction standby time, history such as can be the standby time of nearest 10 electronic systems 100 standby time.History can be carried out adding up and storing by power management module 122 standby time when each electronic system 100 is left unused.After power management module 122 obtains multiple history standby time, the mode of weighted mean each history standby time can estimate prediction standby time of this electronic system 100.
Then, in step S312, power management module 122 judge prediction standby time deduct second standby time T
idlewhether be greater than target standby time.When prediction standby time deduct second standby time T
idlewhen being greater than target standby time, continue step S314.Otherwise, when prediction standby time deduct second standby time T
idlewhen being not more than target standby time, continue step S316.Wherein, CPU (central processing unit) 110 switches to power that the second low power consumpting state consumes, maintains the power that the second low power consumpting state consumes and the summation switching back the power that the first low power consumpting state consumes from the second low power consumpting state and equal CPU (central processing unit) 110 within target standby time, maintain the power that the first low power consumpting state consumes within target standby time from the first low power consumpting state.Due to CPU (central processing unit) 110 the second low power consumpting state (as C3/C4 state) the power of power consumption that consumes be less than the first low power consumpting state (as C2 state) the power that consumes, but CPU (central processing unit) 110 produces peak power when entering and exit the second low power consumpting state (as C3/C4 state), therefore prediction long enough standby time (the such as step S312 when electronic system 100 is only had, prediction is greater than target standby time standby time), then represent that now CPU (central processing unit) 110 is from entering the second low power consumpting state until wake consumed power up from the second low power consumpting state can be less than the power maintaining the first low power consumpting state and consume, now CPU (central processing unit) 110 enters the second low power consumpting state and can reduce power consumption and the waste of system power dissipation and usefulness can not be caused to reduce.In certain embodiments, target to can be standby time an empirical value or by experiment try to achieve just when, judged that CPU (central processing unit) 110 enters the second low power consumpting state and whether meets benefit by this, avoid CPU (central processing unit) 110 frequently to switch between the first low power consumpting state and the second low power consumpting state, and cause computer system power consumption to increase on the contrary.
In step S314, power management module 122 judge each peripheral modules whether in second standby time T
idleinside all do not send data access request.If so, then step S318 is entered.Otherwise then enter step S316.The similar Fig. 2 step S210 of relevant technical details of step S314, does not repeat them here.
In step S316, power management module 122 maintains CPU (central processing unit) 110 and is arranged at the first low power consumpting state (as C2 state), and waits for that corresponding peripheral modules turns back to step S306 after completing after the corresponding transmission of the data corresponding to data access request.The similar Fig. 2 step S212 of relevant technical details of step S316, does not repeat them here.
In step S318, CPU (central processing unit) 110 is set to the second low power consumpting state (as C3/C4 state) by power management module 122, to reduce the power attenuation of electronic system 100.On the other hand, after CPU (central processing unit) 110 enters the second low power consumpting state, if peripheral modules 124-1, one of 124-2,124-3 are in sending data access request, then CPU (central processing unit) 110 can be waken up to the first low power consumpting state from the second low power consumpting state to carry out corresponding data transmission by power management module 122.The similar Fig. 2 step S214 of relevant technical details of step S318, does not repeat them here.
In some embodiments of the invention, when the requirement CPU (central processing unit) that power management module 122 receives operating system (Operation System) enters the second low power consumpting state request (such as, step S202 or step S302), power management module 122 also exports idle alerting signal to each peripheral modules 124-1,124-2,124-3, and expedited data transmits when peripheral modules 124-1,124-2,124-3 receive idle alerting signal.In other words, completed the space that data transmit peripheral modules internal buffer of soaring by be set to the second low power consumpting state (C3/C4 state) in CPU (central processing unit) 110 before as far as possible, the time that this peripheral modules carries out next data transfer can be postponed, further extend the time of CPU (central processing unit) 110 in the second low power consumpting state (C3/C4 state).
On the other hand, when CPU (central processing unit) 110 is set to the second low power consumpting state (such as, step S214 or step S318), power management module 122 also exports delay reminding signal to each peripheral modules 124-1,124-2,124-3, when peripheral modules 124-1,124-2,124-3 try one's best when receiving above-mentioned delay reminding signal delayed data transmission, postpone the time that this peripheral modules carries out next data transfer by this, further extend the time of CPU (central processing unit) 110 in the second low power consumpting state (C3/C4 state).
Below describe in detail above-mentioned idle/embodiment of delay reminding signal, please referring back to Fig. 1, power management module 122 exports IDLE signal to all peripheral modules 124-1,124-2,124-3, to advise that each peripheral modules carries out the opportunity of data transmission.Idle/delay reminding signal for the IDLE signal of 2 bits shown in table 1, certainly here and unrestricted idle/delay reminding signal is the form of following table 1, also can be other form:
Table 1
Below IDLE signal is further explained.
When IDLE signal is 2 ' b00, represent that electronic system 100 is in active state (active), the transmission of each peripheral modules normal process data.
When IDLE signal is 2 ' b01, be aforesaid idle alerting signal, represent that electronic system 100 is in C2 state, each peripheral modules should process data transfer request as early as possible.Such as, assuming that peripheral modules 124-1 comprises the buffer zone that can keep in continuous 100us packet, and when this buffer zone is filled to the packet that namely 60%(fills continuous 60us) time start data transmission, with by data write dynamic RAM (DRAM) in buffer zone.When receiving the IDLE signal being encoded to 2 ' b01, peripheral modules 124-1 should as early as possible by the data write dynamic RAM in buffer zone, and need not wait for that the buffer zone of its inside is filled to 60%, make its buffer zone be in empty (empty) state when entering C3/C4 state after a while as far as possible.In addition, also such as, when peripheral modules 124-2 is an Audio Controller (High Definition Audio Controller), it should read more data stored in its internal buffer from dynamic RAM when receiving idle alerting signal (IDLE=2 ' b01) as far as possible, make its buffer zone be in full (full) state when entering C3/C4 state after a while as far as possible, and then extend the time that CPU (central processing unit) 110 is in C3/C4 state after C2 state enters C3/C4 state.
When IDLE signal be encoded to 2 ' b10 time, be aforesaid delay reminding signal, expression system is in C3/C4 state.Each peripheral modules does not send data transmission as far as possible, is in C3/C4 state as far as possible to make CPU (central processing unit) 110.For example, data transfer request is sent when supposing that the buffer zone of original peripheral modules 124-1 is filled to 60%, when peripheral modules 124-1 receives above-mentioned delay reminding signal (IDLE=2 ' b10), then change into when buffer zone being filled to 80% and just send data transfer request, and then extend CPU (central processing unit) 110 in the time of C3/C4 state.
Should be appreciated that, those skilled in the art do not deviate under spirit of the present invention and category can delete the step of said method, increase or change order.Though the present invention describes preferred embodiment as above, because understanding above-mentioned disclosed content and being not used to limit the embodiment of the present invention.On the contrary, it contains multiple change and similar configuration (those skilled in the art can obviously learn).In addition, claim according to the present invention the deciphering of most broad sense should be done to comprise all above-mentioned changes and similar configuration.
Claims (17)
1. a method for managing power supply, be applicable in an electronic system, wherein above-mentioned electronic system comprises a CPU (central processing unit) and multiple peripheral modules, and the power supply status of above-mentioned CPU (central processing unit) has at least one duty, one first low power consumpting state, one second low power consumpting state, above-mentioned method for managing power supply comprises:
When receiving one and requiring that CPU (central processing unit) enters the second low power consumpting state request, above-mentioned CPU (central processing unit) is set to above-mentioned first low power consumpting state;
Obtain one first standby time that each above-mentioned peripheral modules is estimated;
Above-mentioned first standby time according to each above-mentioned peripheral modules calculated for one second standby time;
Judge whether all above-mentioned peripheral modules all do not send data access request within above-mentioned second standby time; And
When above-mentioned peripheral modules does not all send data access request within above-mentioned second standby time, above-mentioned CPU (central processing unit) is set to above-mentioned second low power consumpting state,
Wherein, the interval time that the above-mentioned peripheral modules being respectively corresponding each above-mentioned first standby time is transmitted in two groups of data.
2. the method for claim 1, also comprises:
When one of above-mentioned peripheral modules sends data access request within above-mentioned second standby time, maintain above-mentioned CPU (central processing unit) and be arranged at above-mentioned first low power consumpting state; And
When after the data transmission that above-mentioned peripheral modules completes corresponding to data access request, reclocking above-mentioned second standby time is to judge whether each above-mentioned peripheral modules does not all send data access request within above-mentioned second standby time again.
3. the method for claim 1, also comprises:
Estimate that one of above-mentioned electronic system predicts standby time;
Judge that above-mentioned prediction deducts standby time and whether be greater than target standby time above-mentioned second standby time; And
When above-mentioned prediction to deduct standby time be less than above-mentioned target standby time above-mentioned second standby time time, then do not perform and judge whether above-mentioned peripheral modules does not all send the step of data access request within above-mentioned second standby time, and maintain above-mentioned CPU (central processing unit) and be arranged at above-mentioned first low power consumpting state.
4. method as claimed in claim 3, wherein also comprises:
Obtain the multiple history standby time of above-mentioned electronic system; And
By above-mentioned history weighted mean standby time to calculate above-mentioned prediction standby time.
5. the method for claim 1, wherein the second low power consumpting state request that enters of above-mentioned requirements CPU (central processing unit) is sent by an operating system.
6. the method for claim 1, is wherein set to the maximum of above-mentioned first standby time of above-mentioned peripheral modules above-mentioned second standby time.
7. the method for claim 1, wherein when receiving above-mentioned requirements CPU (central processing unit) and entering the second low power consumpting state request, also exports an idle alerting signal to above-mentioned peripheral modules; And the expedited data transmission when above-mentioned peripheral modules receives above-mentioned idle alerting signal, wherein when above-mentioned CPU (central processing unit) is set to above-mentioned second low power consumpting state, also export a delay reminding signal to above-mentioned peripheral modules; And when above-mentioned peripheral modules receives the slow data transmission of above-mentioned delay reminding signal time delay.
8. the method for claim 1, wherein above-mentioned first low power consumpting state is the C2 state of an ACPI definition, and above-mentioned second low power consumpting state is C3 state or the C4 state of the definition of described ACPI.
9. an electronic system, comprising:
One CPU (central processing unit), the power supply status of above-mentioned CPU (central processing unit) has at least one duty, one first low power consumpting state, one second low power consumpting state;
Multiple peripheral modules; And
One power management module, when receiving one and requiring that CPU (central processing unit) enters the second low power consumpting state request, is set to above-mentioned first low power consumpting state by above-mentioned CPU (central processing unit),
Wherein, one first standby time that above-mentioned power management module is estimated in order to obtain each above-mentioned peripheral modules, above-mentioned first standby time according to each above-mentioned peripheral modules calculated for one second standby time, and judge whether all above-mentioned peripheral modules all do not send data access request within above-mentioned second standby time
Wherein, when within above-mentioned second standby time, above-mentioned peripheral modules does not all send data access request, above-mentioned CPU (central processing unit) is set to above-mentioned second low power consumpting state by above-mentioned power management module,
Wherein, the interval time that the above-mentioned peripheral modules being respectively corresponding each above-mentioned first standby time is transmitted in two groups of data.
10. electronic system as claimed in claim 9, wherein when one of above-mentioned peripheral modules sends data access request within above-mentioned second standby time, above-mentioned power management module maintains above-mentioned CPU (central processing unit) and is arranged at above-mentioned first low power consumpting state, when above-mentioned peripheral modules is after completing the transmission of the data corresponding to data access request, above-mentioned power management module judges whether each above-mentioned peripheral modules does not all send data access request within above-mentioned second standby time again.
11. electronic systems as claimed in claim 10, wherein above-mentioned power management module also comprises an idle timer, above-mentioned second standby time during this idle timer, when after the data transmission that above-mentioned peripheral modules completes corresponding to data access request, above-mentioned power management module restarts this idle timer.
12. electronic systems as claimed in claim 9, wherein above-mentioned power management module also estimates prediction standby time of above-mentioned electronic system, and judges that above-mentioned prediction deducts standby time and whether be greater than target standby time above-mentioned second standby time,
Wherein, when above-mentioned prediction to deduct standby time be less than above-mentioned target standby time above-mentioned second standby time time, above-mentioned power management module does not then judge whether above-mentioned peripheral modules does not all send data access request within above-mentioned second standby time, and maintains above-mentioned CPU (central processing unit) and be arranged at above-mentioned first low power consumpting state.
13. electronic systems as claimed in claim 12, wherein above-mentioned power management module also obtains the multiple history standby time of above-mentioned electronic system, and by above-mentioned history weighted mean standby time to calculate above-mentioned prediction standby time.
14. electronic systems as claimed in claim 9, wherein the second low power consumpting state request that enters of above-mentioned requirements CPU (central processing unit) is sent by an operating system.
15. electronic systems as claimed in claim 11, are wherein set to the maximum of above-mentioned first standby time of above-mentioned peripheral modules above-mentioned second standby time.
16. electronic systems as claimed in claim 11, wherein when above-mentioned power management module receive above-mentioned requirements CPU (central processing unit) enter the second low power consumpting state request time, above-mentioned power management module also exports an idle alerting signal to above-mentioned peripheral modules, and the expedited data transmission when above-mentioned peripheral modules receives above-mentioned idle alerting signal, wherein when above-mentioned CPU (central processing unit) is set to above-mentioned second low power consumpting state, above-mentioned power management module also exports a delay reminding signal to above-mentioned peripheral modules, and data transmission is suspended when above-mentioned peripheral modules receives above-mentioned delay reminding signal.
17. electronic systems as claimed in claim 11, wherein above-mentioned first low power consumpting state is the C2 state of an ACPI definition, and above-mentioned second low power consumpting state is C3 state or the C4 state of the definition of described ACPI.
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| TW102105805A TWI502332B (en) | 2013-01-06 | 2013-02-20 | Method for power management and a electronic system using the same |
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| CN106020413A (en) * | 2016-05-03 | 2016-10-12 | 深圳市金立通信设备有限公司 | Method for decreasing power consumption of terminal and terminal |
| US20180188797A1 (en) * | 2016-12-29 | 2018-07-05 | Intel Corporation | Link power management scheme based on link's prior history |
| US10503241B2 (en) * | 2017-05-16 | 2019-12-10 | Micron Technology, Inc. | Providing energy information to memory |
| JP7118795B2 (en) * | 2018-08-01 | 2022-08-16 | キヤノン株式会社 | POWER RECEIVING DEVICE, CONTROL METHOD AND PROGRAM THEREOF |
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| US20140195840A1 (en) | 2014-07-10 |
| TWI502332B (en) | 2015-10-01 |
| CN103076868A (en) | 2013-05-01 |
| US9292072B2 (en) | 2016-03-22 |
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